android延时处理任务范例

今天要做一个任务，要求图片做button开关，点击出发对应事件。点击打开，图片左边显示几行字体，这几行字体是延时显示的。以下将主要代码附上。以下是main.xml

<?xml version="1.0" encoding="utf-8"?>  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"      android:orientation="horizontal"      android:layout_width="fill_parent"      android:layout_height="fill_parent"    android:layout_weight="6">      <LinearLayout     android:orientation="vertical"       android:layout_width="80dp"    android:layout_height="fill_parent"    android:gravity="center"    android:layout_weight="2.5">            <TextView             android:id="@+id/txtView01"            android:layout_width="wrap_content"      android:layout_height="wrap_content"    android:text=""            android:textColor="#ff00"            android:textSize="20sp"/>        <TextView             android:id="@+id/txtView02"            android:layout_width="wrap_content"      android:layout_height="wrap_content"    android:text=""    android:textColor="#999933"    android:textSize="20sp"/>        <TextView             android:id="@+id/txtView03"            android:layout_width="wrap_content"      android:layout_height="wrap_content"    android:text=""    android:textColor="#ff33cc"    android:textSize="20sp"/>        <TextView             android:id="@+id/txtView04"            android:layout_width="wrap_content"      android:layout_height="wrap_content"    android:text=""    android:textColor="#993399"    android:textSize="20sp"/>            </LinearLayout>        <ImageView        android:id="@+id/start"       android:layout_width="wrap_content"    android:layout_height="wrap_content"     android:src="@drawable/blue"     android:layout_gravity="center"     android:layout_weight="1"    />         <LinearLayout     android:orientation="vertical"      android:layout_width="80dp"      android:layout_height="fill_parent"    android:gravity="center"    android:layout_weight="2.5">        <TextView             android:id="@+id/txtView05"            android:layout_width="wrap_content"      android:layout_height="wrap_content"    android:text=""    android:textColor="#ff6666"            android:textSize="20sp"            />                <TextView             android:id="@+id/txtView06"            android:layout_width="80dp"      android:layout_height="wrap_content"    android:text=""    android:textColor="#003366"            android:textSize="20sp"            />                     </LinearLayout>    </LinearLayout>

延时处理要用到下面代码

new Handler().postDelayed(new Runnable(){        public void run() {        //execute the task        }     }, delay);

java代码MainActivity.java例如以下：

package com.example.vieweffect;import android.app.Activity;import android.app.ActionBar;import android.app.Fragment;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Bundle;import android.os.Handler;import android.view.LayoutInflater;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.widget.ImageButton;import android.widget.ImageView;import android.widget.TextView;import android.os.Build;public class MainActivity extends Activity {TextView txtview01;TextView txtview02;TextView txtview03;TextView txtview04;TextView txtview05;TextView txtview06;private ImageView start =null;protected boolean isBrewing = false; // button置换@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);txtview01=(TextView)findViewById(R.id.txtView01);txtview02=(TextView)findViewById(R.id.txtView02);txtview03=(TextView)findViewById(R.id.txtView03);txtview04=(TextView)findViewById(R.id.txtView04);txtview05=(TextView)findViewById(R.id.txtView05);txtview06=(TextView)findViewById(R.id.txtView06);start=(ImageView)findViewById(R.id.start);start.setOnClickListener((new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubif(v==start){              if(isBrewing)                  stopView();              else                  startView();                        } }}));}//開始  public void startView(){  Bitmap bmp=BitmapFactory.decodeResource(getResources(), R.drawable.stop);//打开资源图片             start.setImageBitmap(bmp);           txtview01.setText("打开串口...");        new Handler().postDelayed(new Runnable(){              public void run() {              //execute the task              txtview02.setText("打开A...");            }           }, 500);                 new Handler().postDelayed(new Runnable(){              public void run() {              //execute the task              txtview03.setText("打开B...");            }           }, 1000);                 new Handler().postDelayed(new Runnable(){              public void run() {              //execute the task              txtview04.setText("打开C...");            }           }, 1500);                 isBrewing = true;  }  //停止  public void stopView(){  Bitmap bmp=BitmapFactory.decodeResource(getResources(), R.drawable.blue);//打开资源图片             start.setImageBitmap(bmp);           txtview01.setText("");        txtview02.setText("");        txtview03.setText("");        txtview04.setText("");                txtview05.setText("");        txtview06.setText("");        isBrewing = false;  }  }

效果图例如以下：执行后先出现下面界面

android延时处理任务范例，点击该蓝色图片后，

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